I believe this warrants a new topic for those of you who does not want to dig through pages of posts. For referenence, here they are: http://forums.storagereview.net/index.php?showtopic=26549 http://forums.storagereview.net/index.php?showtopic=26006 Simply put: PROPER WORKING NCQ is without a doubt, the single most important upgrade for a power user in almost a decade i believe. Now you can multitask. I didn't need any more processing power than my good ole 3.0 GHz Northwood purchased 8 years ago. But nonetheless, upgraded to Q6600. Imagine my surprise to find that my new system with quad cores o/c'ed to match old clock (@3.0GHz), 8600GTs, half a tb of fastest SATAII NCQ drive did not seem even a bit more responsive than the one bought almost a decade ago. I couldn't do a copy or virus scan operation without having my system in complete halt until the task completed. Took 3dmark 3 mins to start! Where the heck was multitasking? I use my pc heavily for multimedia, leisure, business and come on, let's face it... not everyone plays games whole days and nights... so latest and fastest CPU and GPU meant nothing for me. My system performed not any different than the one bought 8 years ago. As it turns out, I just needed to get SATAII NCQ properly working... meaning that I needed to find a drive that has NCQ working properly as opposed to one that advertises it has NCQ. After reading czr's topic and tests, i started hunting for a 500GB 7200.11.. But i still could not find this drive where i am... and i was not willing to go for a 3-platter 750GB version (heat-noise). I wish i had... i wouldn't be wasting so many months. HD_Speed Results (http://www.steelbytes.com/?mid=20) SEAGATE ST3750330AS 7200.11 (750 GB, 7200 RPM, SATA-II) 1 instance: 110 MB/s 2 instance: 103 MB/s (0% and 50%, 256K blocks) 10 instances: 75-80 MB/s (at 10% intervals, 256K blocks) SAMSUNG HD501LJ (500 GB, 7200 RPM, SATA-II) 1 instance: 98 MB/s 2 instance: 20 MB/s I no longer need to wait 3 mins for a program to start up when i am copying some files And best of all, I needed to do nothing. I just ghosted my samsung to seagate and rebooted... All worked right away. If you are using a single drive, if your os partition and data is on a single drive, i wouldnt imagine something more useful than a proper NCQ implementation. Thank you, thank you, thank you all... especially CZR... for bringing this to my attention. I can heartily say that this is the best upgrade for me in the last 10 years. PS: My pc is the same, absolutely no changes... only the hard drive changed (From 500GB supposedly SATAII supporting Samsung to Seagate 7200.11). Here are my specs from everest: QuadCore Intel Core 2 Quad Q6600, 2400 MHz (9 x 267) Gigabyte GA-X38-DQ6 (2 PCI, 3 PCI-E x1, 2 PCI-E x16, 4 DDR2 DIMM, Audio, Dual Gigabit LAN, IEEE-1394) 2048 MB (DDR2-800 DDR2 SDRAM) NVIDIA GeForce 8600 GT (256 MB) HP w2207 [22" LCD] (CND7293M40) Intel� ICH9 SATA AHCI Controller SAMSUNG HD501LJ (500 GB, 7200 RPM, SATA-II) ACPI x64-based PC Microsoft Windows Server 2008 Enterprise O/c: 8 x 400MHz 3.2 GHz @1.35v, 1067 MHz DDR2 5-5-5-16 CR2